Philancia is a Greek name, with Anglicized nicknames Philancy and Philancie.

1.  Marriage Record:

2.  1840 Census Index/Images (online at Ancestry.com; Image #7 of 9; extracted by Diana Gale Matthiesen):¤•/NR

1840

MI

Livingston Co.

Unadilla Twp.

Roll 212

p. 215B

Ln. 11

Lucas Hopkins

100 001 - 110 001

These data indicate:

No. & Sex	Age Class	Therefore Born	Individuals Inferred
1 male	4 or under	1835-1840	= Son A
1 male	30-39	1800-1810	= Samuel Lucas (b. 1800/1)
1 female	4 or under	1835-1840	= Daughter A
1 female	5-9	1830-1835	= Martha (b. 1834)
1 female	30-39	1800-1810	= Philancia (b. 1810/1)

The list was roughly alphabetized, so no neighborhood reconstuction is possible.  Also in Unadilla Township:  Samuel's brother, Philander HOPKINS.

3.  1850 Census Index/Images (online at Ancestry.com; Image #193 of 502 — Philancia is indexed "Philamena"; Samuel's birthplace was transcribed, "Wisconsin"):  City of Detroit, Wayne Co., MI, Roll M432_365, p. 97A, 1101/1363 (one of four families in the dwelling), enumerated 11 Sep 1850, official enumeration date 1 Jun 1850 (extracted by Diana Gale Matthiesen):¤•/NR

Saml Hopkins	49	M		Carpenter		Vermont
Philancia "	39	F				"
Martha    "	16	F				NY
Saml      "	9	M				Mich
Sarah     "	7	M				"

Philancia was born in NY, not VT.

4.  1860 Census Images (online at Ancestry.com; Image #10 of 36):  Hastings P.O., Hastings Village, Barry Co., MI, p. 754, PN 131, 1042/969, enumerated 6 Jul 1860, official enumeration date 1 Jun 1860 (extracted by Diana Gale Matthiesen):¤•/NR

Ira B. Brown	31	M	Painter	50	NY
Martha	27	F			NY
[Ira & Martha's children]
Philancy Hopkins	48	F			NY
Sarah Hopkins	16	F			Mich

5.  Timothy Hopkins.  1932.  John Hopkins of Cambridge, Massachusetts, 1634, and Some of His Descendants. Stanford Univ. Press, Stanford, CA (available as a facsimile reprint from Higginson Books and online by subscription at GenealogyLibrary.com):

p. 348	207.  SAMUEL LUCAS7 (NEHEMIAH,6 NEHEMIAH,5 EBENEZER,4 EBENEZER,3 STEPHEN,2 JOHN1), m. Philancy Holt, b. at Sempronius, New York, daughter of Seth Holt,a b. at Westminster, Massachusetts, 2 April 1776, and Abigail Cheney of Brandon, Vermont. (Holt Gen.)  He d. at Detroit, Michigan, about 1856; she d. about 1864.    A carpenter.  His grand-nephew, Professor B. Smith Hopkins, thinks aSeth was son of Silas Holt, b. at Marlborough, Massachusetts, 1753, who was a soldier in the Revolution.  For his record see Massachusetts Soldiers and Sailors in the Revolution, 8: 196.
p. 349	he removed with his father in about 1836 from Lockport, New York, to Unadilla, Michigan; that he served in the Mexican war and lost a leg in action.  At the time of his marriage he was of Hastings, Michigan. 'His widow m. (2) a Mr. Diamond.' Children: Martha, b. 1838... Samuel Holt, b. 17 May 1841... Sarah, b. 1843. ______Children: ______MARTHA,8 b. 1838; m. at Stockbridge, Michigan, Ira Brown.  They are said to have lived in Missouri... 415.  SAMUEL HOLT,8 b. 17 May 1841; m. Emma Fay. ______SARAH,8 b. 1843
Nehemiah is said to have died in New York, and even this author makes no mention of Nehemiah leaving New York under Nehemiah's own entry.  At the time of his marriage, Samuel Lucas was almost certainly "of New York," not Michigan.  In the 1830 Census, Philancia was living in Somerset, Niagara Co., NY, with her mother, Abigail (CHENEY) HOLT GALUSHA, and step-father, Daniel GALUSHA.  Martha testified in her application for a widow's pension that she was born in 1834 in Somerset, NY.  It seems highly likely that Philancia and Samuel were married, if not in Somerset, then at least in Niagara Co., and certainly in NY.   Samuel probably did move from Lockport, Niagara Co., NY, in 1836, but it was in the company of his wife and daughter, not his father.  The probable reason for the error of Martha's birthdate and place (as 1838 in MI, instead of 1834 in NY) was such that someone could not otherwise reconcile Samuel being "of Michigan" when he supposedly married.  Prof. B. Smith HOPKINS is son of Loren, son of Philander, brother of Samuel Lucas.

6.  John H. Keatley.  1883.  History of Pottawattamie County, Iowa.  O.L. Baksin & Co., Chicago (online at GoogleBooks):

p. 101

SAMUEL H. HOPKINS, farmer, P.O. Macedonia, born in Michigan May 17, 1841, son of Samuel and Philancy (Holt) Hopkins, he, a carpenter, born in Vermont, died in Michigan in 1854; she, born in New York, died in Missouri in 1863.  They had five children, two of whom are living...

7.  Emails from Kathleen Hontz, Grecia DeRossett.